Re: Backup power supply

Mike Scott <usenet.16@scottsonline.org.uk.invalid> wrote:

On 13/03/2024 13:18, Andriy D wrote:

Hi,
 
I'm considering adding some backup power supply for my RPi2 mainly

 
No answers - but it's something I've been wondering about off and on
(albeit for a Pi4). All the commercial stuff I've seen much exceeds the
base Pi in either pounds [Sterling] or W (or both).
 
Any offers out there? Even something with a stack of AA
non-rechargeables would be fine.

For one Pi a 5 volt regulator connected to a battery
that's held on a float charger is probably the cheapest,
though I think the combo will cost more than any Pi. The
efficiency of such a setup is poor, but for one Pi it's
probably better than a more elaborate scheme. Also, there
is no need for line detection logic, which can be tricky.

For my part I settled on a small inverter/charger connected
to a 12 volt battery. It's even more expensive, but has extra
capacity to run all of my computer and network equipment.
Cost at the time was about $600, more than half of it the
lithium iron phosphate battery. A bit cheaper now.

Rated output is 800 W 120 VAC 60 Hz. The battery can deliver
about half that power for about an hour, or run my equipment
overnight. Standby loss is about 10 watts.  

HTH,

bob prohaska